Test and the mean score turns out
A new test was designed to have a mean of 80 and a standard deviation of 10. A random sample of 20 students at your school take the test and the mean score turns out to be 85. Does the score differ significantly from 80?
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The mean and the standard deviation of the sample of 100 bank customer waiting times in Table 1.8 are (xbar=5.49) and s=2.317. Calculate a t-based 95 percent confidence interval for U, the mean of all possible bank customer waiting times using the
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